I was wondering if I could continue using my sand filter but add a cartridge filter after it to better the filtration rate. I have a 30000 pool with a 1 hp hayward super 2 pump and a hayward s244t 300 lb sand filter. I've always had issues keep the pool clear here in Phoenix when it hits 110 even when the sand was new. I'm looking at hayward large 8 cartridge filter system. And I figured by leaving the sand filter it would keep the cartridges cleaner since sand is easy to backwash. Does anyone see any problems coming from this?